CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2018		Jun. 30, 2017	Jun. 30, 2018		Jun. 30, 2017
Operating Revenues:
Operating Revenues	$ 816		$ 811	$ 1,736		$ 1,657
Operating Costs and Expenses:
Marketing purchases	265		253	520		504
Operating expenses	193		164	382		311
General and administrative expenses	59		58	114		108
Restructuring charges	18			18
Depreciation, depletion and amortization	142		123	285		229
Taxes, other than income taxes	15		25	38		51
Total Operating Costs and Expenses	692		623	1,357		1,203
Operating Income	124		188	379		454
Interest Expense:
Interest on debt	59		59	124		117
Other interest charges	2		3	4		5
Interest capitalized	(29)		(28)	(57)		(56)
Total Interest Expense	32		34	71		66
Gain (Loss) on Derivatives	(36)		134	(43)		250
Loss on Early Extinguishment of Debt	(8)		(10)	(8)		(11)
Other Income, Net	3		6	2		8
Income Before Income Taxes	51		284	259		635
Provision (Benefit) for Income Taxes:
Current
Deferred
Total Provision (Benefit) for Income Taxes
Net Income	51	[1]	284	259	[1]	635
Mandatory convertible preferred stock dividend			27			54
Participating securities - mandatory convertible preferred stock			33	2		76
Net Income Attributable to Common Stock	$ 51		$ 224	$ 257		$ 505
Earnings Per Common Share:
Basic	$ 0.09		$ 0.45	$ 0.45		$ 1.02
Diluted	$ 0.09		$ 0.45	$ 0.44		$ 1.02
Weighted Average Common Shares Outstanding:
Basic	581,159,200		496,419,815	576,255,744		494,753,391
Diluted	582,878,106		498,224,599	578,222,740		496,627,843
Gas Sales [Member]
Operating Revenues:
Operating Revenues	$ 407		$ 471	$ 947		$ 974
Oil Sales [Member]
Operating Revenues:
Operating Revenues	44		23	79		46
NGL Sales [Member]
Operating Revenues:
Operating Revenues	75		37	140		77
Marketing [Member]
Operating Revenues:
Operating Revenues	265		250	518		503
Gas Gathering [Member]
Operating Revenues:
Operating Revenues	24		$ 30	48		$ 57
Other [Member]
Operating Revenues:
Operating Revenues	$ 1			$ 4

[1] In 2018, deferred tax activity incurred in other comprehensive income was offset by a valuation allowance.